MarkhamBuilding InspectionsInspections
45 Minute Fire Resistance Rating for Wall with Rigid Insulation
Published by City of Markham
This is the City of Markham’s document, as published on its website on 18 October 2026. The municipality may have changed it since: check the current version at the source. Legal notice
- Type
- Guide
- Published by
- City of Markham
- Date
- January 1, 2025
- Also called
- 45 Minute Fire Resistance Rating Wall with Rigid Insulation
- For
- builder
- Building types
- All building types
- Pages
- 3
- Instruments
- MMAH Supplementary Standard SB-2 · CAN/ULC-S702.1
Overview
Markham's Builder Tip Issue No. 39, dated January 1, 2025 and listed with the City's 2024 Ontario Building Code housing tips, on a 45 minute rated exterior wall carrying rigid insulation outside the sheathing. It quotes Sentence 9.10.3.3.(2) on fire exposure from inside, Sentences 9.10.15.5.(1) and (1.1), and Sentence 2.3.5.(2) of Supplementary Standard SB-2 on rated exterior wall assemblies. The Objective discusses where low-permeance insulated sheathing goes to avoid condensation and illustrates an SB-2 Zone 1 wall with an outboard-to-inboard thermal resistance ratio above 0.20.
What it covers
- 9.10.3.3. Fire Exposure
- 9.10.15.5. Construction of Exposing Building Face of Houses
- Supplementary Standard SB-2
- 2.3.5. Consideration for Various Types of Assemblies
- Objective
DocHub collects what a municipality published; it cannot tell you what is in force today. A newer version may exist, may be titled differently, or may not be posted publicly at all.
Pick a document. It opens here as the real file — you can select its text, search inside it, follow its own links, and every page is present.